Oracle TO_NUMBER function is used to convert a text/varchar2/varchar/string value into a number value in Oracle 11g or how to convert varchar to number in oracle in the select query or what is conversion function is Oracle SQL or how to use to_number function is Oracle SQL
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https://www.databasestar.com/oracle-to_char/
The Oracle TO_CHAR function is a common and useful string manipulation function. It allows you to convert a number or a date value into a string value.
It allows you to take a number or a string, and convert it to a VARCHAR2 data type.
The syntax of the function is:
TO_CHAR( input_value, [format_mask], [nls_parameter] )
The parameters are:
- input_value: this is the value to convert to a VARCHAR2 value. It can be one of many different number or date data types.
- format_mask is an optional parameter and allows you to specify the format to display the output as. If this is omitted, the function uses a default format.
- nls_parameter: this is also optional and lets you determine a regional parameter for displaying the output value.
The format mask helps you determine what your output is displayed as. For example, if you provide the date of May 3rd, and the output is ‘03/05/2018’, how do you know if this is May 3rd or March 5th? Using a format mask can specify which format is used.
The function is similar to the TO_NUMBER and TO_DATE functions, in that they both convert a specific data type.
For more information about the Oracle TO_CHAR function, including all of the SQL shown in this video and the examples, read the related article here:
https://www.databasestar.com/oracle-to_char/

This video we are going to discuss the NUMBER data type. The Number data type is used to store integers, and real numbers. When you create a column as a NUMBER, you can store pretty huge or pretty small numbers in this column. Now there are two things you need to consider when working with numbers, and that is the precision as well as the how big the number is.
For example, we can store the number 9.9. This has two significant digits. We could also store the number 9.9 X 10^4. In this situation, the number is much larger, but the number of significant digits is the same. 9.9 are the significant digits. When we expand this out we just have 99000, and the zeros are just used for size and are not considered "significant" in this situation. In fact, you get a max precision of 38, but a maximum value of 9.99 * 10^125. You can also use this data type to store very small numbers. Check the docs for the specifics on maximums and minimums.
You can provide it with two pieces of information:
Precision - The total number of digits.
Scale - The number of digits to the right of the decimal.
You do it in this format: NUMBER (precision, scale).
The important thing to remember in this is that when you specify a precision, you will be limiting the max size of the numbers.
The secret behind this data type is that it is actually stored in scientific notation. That is we store a number and then we can multiply it by 10 raised to some power. This allows us to store much larger numbers without taking up a ton of space.
The oracle docs actually gives a formula that you can use to see how much storage is going to be required for a specific NUMBER data type.
How much precision can be used? The acceptable range is 1-38.
What about scale? The range is actually -84 to 127. I'll explain the scale in more detail in an upcoming video. That's because there is a lot of confusing things here…What does it mean for the scale to be negative? How can we have a scale that is bigger that the total number of digits available through the precision. That's a topic for another video.
It's important to understand that when we increase our scale, we decrease the max size of the number. For example if we have a precision of 5 and a scale of 3, the highest number we can store is 99.999. This is in contrast to a precision of 5 and a scale of 2 which allows for up to 99.999. Either way you get 5 significant digits, but the numbers of digits to the left and right of the decimal change.
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See how in 15 minutes you can generate SQL statements, anonymous PL/SQL blocks to run your programs, get help completing database object names, and re-using frequently used snippets of code or queries in Oracle SQL Developer.

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In this tutorial for database 11g You will see how to enable Line numbers in SQL Developer.
This SQL tutorial and Oracle database 11g tutorial for beginners will show how to enable Line numbers in SQL Developer.
Tool used in this tutorial is SQL developer.
This tutorial series is part of SQL expert exam certification training. if you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training.
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SQL Server Query writing strategies is something I have yet to find in any book. When enthusiastic SQL students do this, they experience a revelation. The number of errors drops significantly and the speed at writing complex queries increases immediately. Knowing how to narrow down what we are looking for amongst a vast list of choices helps immensely. Grabbing the right tables first and then the fields second is akin to grabbing the right menu before ordering an item from it. In fact, one student named Tim took this back to his team of SQL developers and they immediately implemented this process.
We are all used to following steps. Most of the time, actions are sequential from top to bottom or left to right. Other times we complete things in phases. The two phases we are going to use in this exercise apply to joining tables. This is easy to implement as we only need remember to organize first and clean up second.
When visiting a new restaurant, we will ask to see the menu, because we want to see all they have to offer. The odds are that we might be interested in half of the items, but only need a few dishes for our group at the table. Looking at the menu is like starting a query with a ‘SELECT *’ statement. Once we have looked at all the fields, we narrow our choice(s) to only the items we want at the time.
Sometimes restaurants have multiple menus. My favorite restaurant has a kids’ menu, an adult menu, a gluten-free menu and a drink menu. These menus were each gathered at our table. Ultimately, in my head, a selection was narrowed to what was needed.
Phase I: Organize. When building a new query from many tables, we often find ourselves wondering, “Where do I start?” First, lay the steps out by identifying which tables contain the essential data. Second, get all the table joins working with a basic ‘SELECT *’ statement. Third, add any basic filtering criteria.
Phase II: Itemize. Once all joins and criteria, such as SELECT, FROM and WHERE are working, we are ready for Phase II. This entails going back and changing our ‘SELECT *’ to an itemized SELECT field list as the final step.
Let’s explore how this two-phase process of Organize and then Itemize can be a big time-saver. We are going to use one of the challenges from the last lab. In Lab 3.2 (Outer Joins), Skill Check 2, we needed to get four fields from two different tables. If we were to list all four desired fields and test one table at time, we will get an error as seen on the right side of the figure below.
In the figure below we write a SELECT statement and part of the FROM clause. When completed, the FROM clause will have two tables, but for now we just want to get the Location table working. By using the ‘SELECT *’ strategy, we remove any possible errors from line 1. From there, we can focus on the more complicated logic used for joining tables together. We can add tables one at a time until everything is working. This is the Organize phase.
NOTE: SELECT * never results in an Error message stating “invalid column name”, however; a SELECT list with itemized field(s) can have this error.
After our query is organized and working, we can go back and itemize the SELECT field list to display only the fields that are necessary. This is done during Phase II (Itemize). The steps for this system are broken down as follows:
Since SELECT is always the first statement in a query, it’s natural to want to write the field names before writing the FROM clause. However; we can save time and trouble by using the ‘*’ until the entire query is working properly. When this is complete, it is very easy to itemize the field list, with the confidence of knowing it will not cause any problems.
Exercise:
Simple membership for a club:
Table1 (id_Member,name_Member, email_member, title, age, company)
Table2 (id_Club,club_name, club_Location, address)
Table3 (id_club, id_member,membership_date)
Q1: Show all member names, email, age, and company from Table1
Q2: Show all club name, location, and address data
Q3: Show member name, club name, club location (hint: Use joins and all 3 tables)
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In this video I take a look at the structure of tables I plan on using for my database and point on the relational links between the tables. I also discuss the primary key of the table as well as using it as a foreign key in a related table. I take a look at a few basic data types for field columns to include:
CHAR = 255 characters
VARCHAR = 255 characters
SMALLINT = -32,768 to 32,767
INT = -2,147,483,648 to 2,147,483,647
DECIMAL = Numbers with a decimal value
Date = In the format DD-MMM-YYYY
This video is part of a series of videos with the purpose of learning the SQL language. For more information visit Lecture Snippets at http://lecturesnippets.com.

New to Oracle and .NET development? This video gives you everything you need to know to get up and running quickly!
We walk you through downloading and installing the needed Oracle software and then connecting in Visual Studio and creating a simple C# application.
The video starts at the Oracle .NET Developer Technology Center website at http://otn.oracle.com/dotnet
We then download the "ODTwithODAC" package, extract it and run the installer. Note that ODAC version 12 works with Oracle Database versions 10.2 or higher.
After installing we connect in Server Explorer and learn about the connection dialog features, including the Filters tab which by default filters out additional schemas you may have privileges on. We connect to the database using the easy to use EZ connect format.
Finally we create a simple C# application and connect to the database using ODP.NET Managed driver and a EZ Config connect string.
Prerequisites:
1) Visual Studio 2012 or 2013 -- any edition except Express Edition. Visual Studio Community Edition is supported.
2) An Oracle Database to connect to. You will need to know the hostname, port number and service name of the database.
During the video we install:
Oracle Data Provider for .NET
Oracle Developer Tools for Visual Studio
Oracle .NET Samples
Oracle .NET Documentation

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A variable is nothing but a name given to a storage area that our programs can manipulate. Each variable in PL/SQL has a specific data type, which determines the size and layout of the variable's memory; the range of values that can be stored within that memory and the set of operations that can be applied to the variable.
The name of a PL/SQL variable consists of a letter optionally followed by more letters, numerals, dollar signs, underscores, and number signs and should not exceed 30 characters. By default, variable names are not case-sensitive. You cannot use a reserved PL/SQL keyword as a variable name.
PL/SQL programming language allows to define various types of variables, which we will cover in subsequent chapters like date time data types, records, collections, etc. For this chapter, let us study only basic variable types.
With PL/SQL you can declare variables and then use them in SQL and procedural statements anywhere that an expression can be used. Variables can be used for the following:
• Temporary storage of data: Data can be temporarily stored in one or more variables for use when validating data input and for processing later in the data flow process.
• Manipulation of stored values: Variables can be used for calculations and other data manipulations without accessing the database.
• Reusability: After they are declared, variables can be used repeatedly in an application simply by referencing them in other statements, including other declarative statements.
• Ease of maintenance: When using %TYPE and %ROWTYPE (more information on %ROWTYPE is covered in a subsequent lesson), you declare variables, basing the declarations on the definitions of database columns. If an underlying definition changes, the variable declaration changes accordingly at run time. This provides data independence, reduces maintenance costs, and allows programs to adapt as the database changes to meet new business needs. More information on %TYPE is covered later in this lesson.
Types of Variables"
All PL/SQL variables have a data type, which specifies a storage format, constraints, and valid range of values. PL/SQL supports four data type categories—scalar, composite, reference, and LOB (large object)—that you can use for declaring variables, constants, and pointers.
• Scalar data types hold a single value. The main data types are those that correspond to column types in Oracle server tables; PL/SQL also supports Boolean variables.
• Composite data types, such as records, allow groups of fields to be defined and manipulated in PL/SQL blocks.
• Reference data types hold values, called pointers, that designate other program items. Reference data types are not covered in this course.
• LOB data types hold values, called locators, that specify the location of large objects (such as graphic images) that are stored out of line. LOB data types are discussed in detail later in this course.

With this new function, you should never receive following errors again !
ORA 01861: literal does not match format string.
ORA 01722: invalid number.
Following is the list of supported datatype:
1. NUMBER
2. DATE
3. TIMESTAMP
4. TIMESTAMP WITH TIME ZONE
5. BINARY_FLOAT
6. BINARY_DOUBLE
7. INTERVAL DAY TO SECOND
8. INTERVAL YEAR TO MONTH
Tiếng Việt: https://youtu.be/w6gXv8-yYI4

This video describes the various Date Manipulation methods that we can use on table data. This includes To_char, To_date, Date formats etc.
It includes the following functions that include, TO_CHAR, TO_DATE, ‘TH’, ‘SP’, ‘SPTH’ ETC.
All the commands explained with syntax and example.
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This SQL tutorial and Oracle database 11g tutorial for beginners will show how to connect to database either on a local machine or on a machine in your LAN using ip address.
Tool used in this tutorial is SQL developer & command prompt.
This tutorial series is part of SQL expert exam certification training. If you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training.
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In this video we will discuss how to use database data with jQuery datatables plugin. There are many ways to get data into DataTables. If the data is small you can retrieve all the data at once and the processing (i.e paging, searching, ordering) is done on the client-side.
On the other hand if the database data is large, server-side processing can be enabled. With server-side processing enabled, all paging, searching, ordering actions that DataTables performs are handed off to the server.
In this video we will discuss retrieving all the data at once. The datatables plugin performs all the processing (i.e paging, searching, ordering etc) on the client-side.
We want to retrieve data from the following database table tblEmployee. The database data should then be displayed using jQuery datatables plugin

How to Determine if value is Numeric by using ISNumeric and Try_Convert Function in SQL Server - TSQL Tutorial
ISNUMERIC( ) function is provided to us in SQL Server to check if the expression is valid numeric type or not. As per Microsoft it should work with Integers and Decimal data types and if data is valid integer or decimal, ISNumeric() should return us 1 else 0. But ISNUMERIC() does not work as expected with some of values specially when we have "-" or "d" in value and have two numbers after "d" such as 123d22, it still return us 1. Also if we have data in money format $XXXXX e.g $2000, It returns us 1.
In SQL Server 2012. Microsoft introduced new function call Try_Convert( ). You can use try_convert function to convert to required data type and if it is not able to convert then it will return Null as output. As you will see below, I did some experiment and found out that Try_Convert will produce 0 for "-" when we try to convert to Int, That should not be happening as "-" is symbol not Integer. But when I try to convert "-" to decimal, Try_Convert produced Null output.
Take a look in below results and keep in mind the outputs when you have to evaluate expression to Numeric or find out if expression is Numeric or Not.
Blog post link for this video
http://sqlage.blogspot.com/2015/03/how-to-determine-if-value-is-numeric-by.html

This video describes the various Date Manipulation methods that we can use on table data. This includes To_char, To_date, Date formats etc.
It includes the following functions that include, TO_CHAR, TO_DATE, ‘TH’, ‘SP’, ‘SPTH’ ETC.
All the commands explained with syntax and example.
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Oracle Database11g tutorials 14
How to Create table using command prompt and Create table using sql developer
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Time Line
0:25 Introduction of Tables in Database
1:03 What is Create Table (Introduction of create table)
1:30 Syntax of Create Table
2:08 How to create table using Command Prompt
4:55 How to create table using SQL Developer
Links for
Oracle Database tutorials 4: database connectivity using SQL developer and command prompt
http://youtu.be/wSqoXRlXDUU
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http://www.rebellionrider.com/sql-create-table.html
Tool used in this tutorial is command prompt.
This tutorial series is part of SQL expert exam certification training. if you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training.
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This is Manish from RebellionRider.com
Today in this oracle database tutorial we will see How to CREATE A TABLE.
if we have to define a table in layman language then we can say that Tables are just a collection of Rows and Columns but
In RDBMS tables are database objects which help in organizing data into ROWS and COLUMNS.
We can also say that
SQL tables are kind of data structure which are used by database for efficient storage of data.
To create a table in our database we use SQL CREATE TABLE command.
SQL CREATE TABLE is a type of DATA DEFINITION LANGUAGE also known as DDL.
To Create a table in your schema you will require CREATE TABLE system privilege.
In our future videos we will see what are system and object privileges and how to grant them to a user.
Today for this video we will be using Sample schema HR which already has all the necessary privileges.
Ohk Let's see the syntax.
CREATE TABLE table name
(
column name1 Data-Type(size),
column name2 Data-Type(size),
.....
);
CREATE TABLE is an oracle reserved word or say an Oracle key word whereas
There are 3 different ways of creating a table in Oracle database.
Creating a table using Command Line Interface (CLI) in Oracle database
For demonstrating how to create table in oracle database using CLI, I'll be using Command prompt.
Thats how we create table using command prompt.
you can check your table structure by DESCRIBE command
for that just write
DESC and your table name.
Like this
Another way of creating a table is by using Graphic user interface (GUI) in Oracle database
To demonstrate how to create table using GUI we will use SQL developer.
Lets open our SQL developer
I am connected to HR schema
if you do not know how to create a connection to database using SQL developer please watch my oracle database tutorial 4 that explains database connectivity using SQL developer and command prompt. Link for this video is in the description below.
So lets create a table.
Creating a table using SQL developer is very easy we do not have to fire any query here.
Let's start
First of all right click on your connection in which you want to create a table and choose schema browser.
This will open a separate schema browser pane
or you can expend your connection by clicking this + sign and then right click on table and choose New Table.
However I prefer working with schema browser so let's skip to schema browser pane
here from the first drop-down list you can choose connection name
and in the second drop down list you can choose what database objects you want to work with
we want to create a table thus I'll choose table and then click this arrow here and choose option for new table
Ok we have created a table wizard
first of all give a unique name to your table
and add some column as well. For this, click the green plus button. Now we already have a column so give it some name.
Also choose a datatype from the list and specify any size
you can check this not null column if in case you want to make this a mandatory column
you can also specify default value and constraint
If you want to make this column a primary key you can click here
In my future video i'll show you what are these constraints and different ways of applying them on a column in a table.
for this video we will concentrate on create table only
so when you are done with all your columns click ok
Thats your table
You can double click on your table here and can see its structure.
Thats it

In this video, I have explained how to add_subtract_multiply the two columns from the particular table.
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QUESTION 1
You need to create a table for a banking application. One of the columns in the table has the following
requirements:
1) You want a column in the table to store the duration of the credit period.
2) The data in the column should be stored in a format such that it can be easily added and subtracted with
date data type without using conversion functions.
3) The maximum period of the credit provision in the application is 30 days.
4) The interest has to be calculated for the number of days an individual has taken a credit for.
Which data type would you use for such a column in the table?
A. DATE
B. NUMBER
C. TIMESTAMP
D. INTERVAL DAY TO SECOND
E. INTERVAL YEAR TO MONTH
Correct Answer: D
Explanation
Explanation/Reference:
QUESTION 2
Which three tasks can be performed using SQL functions built into Oracle Database?
A. Displaying a date in a nondefault format
B. Finding the number of characters in an expression
C. Substituting a character string in a text expression with a specified string
D. Combining more than two columns or expressions into a single column in the output
Correct Answer: ABC
Explanation
Explanation/Reference:
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